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Linux/arch/powerpc/include/asm/processor.h

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  1 #ifndef _ASM_POWERPC_PROCESSOR_H
  2 #define _ASM_POWERPC_PROCESSOR_H
  3 
  4 /*
  5  * Copyright (C) 2001 PPC 64 Team, IBM Corp
  6  *
  7  * This program is free software; you can redistribute it and/or
  8  * modify it under the terms of the GNU General Public License
  9  * as published by the Free Software Foundation; either version
 10  * 2 of the License, or (at your option) any later version.
 11  */
 12 
 13 #include <asm/reg.h>
 14 
 15 #ifdef CONFIG_VSX
 16 #define TS_FPRWIDTH 2
 17 #else
 18 #define TS_FPRWIDTH 1
 19 #endif
 20 
 21 #ifndef __ASSEMBLY__
 22 #include <linux/compiler.h>
 23 #include <asm/ptrace.h>
 24 #include <asm/types.h>
 25 
 26 /* We do _not_ want to define new machine types at all, those must die
 27  * in favor of using the device-tree
 28  * -- BenH.
 29  */
 30 
 31 /* PREP sub-platform types see residual.h for these */
 32 #define _PREP_Motorola  0x01    /* motorola prep */
 33 #define _PREP_Firm      0x02    /* firmworks prep */
 34 #define _PREP_IBM       0x00    /* ibm prep */
 35 #define _PREP_Bull      0x03    /* bull prep */
 36 
 37 /* CHRP sub-platform types. These are arbitrary */
 38 #define _CHRP_Motorola  0x04    /* motorola chrp, the cobra */
 39 #define _CHRP_IBM       0x05    /* IBM chrp, the longtrail and longtrail 2 */
 40 #define _CHRP_Pegasos   0x06    /* Genesi/bplan's Pegasos and Pegasos2 */
 41 #define _CHRP_briq      0x07    /* TotalImpact's briQ */
 42 
 43 #if defined(__KERNEL__) && defined(CONFIG_PPC32)
 44 
 45 extern int _chrp_type;
 46 
 47 #ifdef CONFIG_PPC_PREP
 48 
 49 /* what kind of prep workstation we are */
 50 extern int _prep_type;
 51 
 52 #endif /* CONFIG_PPC_PREP */
 53 
 54 #endif /* defined(__KERNEL__) && defined(CONFIG_PPC32) */
 55 
 56 /*
 57  * Default implementation of macro that returns current
 58  * instruction pointer ("program counter").
 59  */
 60 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
 61 
 62 /* Macros for adjusting thread priority (hardware multi-threading) */
 63 #define HMT_very_low()   asm volatile("or 31,31,31   # very low priority")
 64 #define HMT_low()        asm volatile("or 1,1,1      # low priority")
 65 #define HMT_medium_low() asm volatile("or 6,6,6      # medium low priority")
 66 #define HMT_medium()     asm volatile("or 2,2,2      # medium priority")
 67 #define HMT_medium_high() asm volatile("or 5,5,5      # medium high priority")
 68 #define HMT_high()       asm volatile("or 3,3,3      # high priority")
 69 
 70 #ifdef __KERNEL__
 71 
 72 struct task_struct;
 73 void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
 74 void release_thread(struct task_struct *);
 75 
 76 /* Prepare to copy thread state - unlazy all lazy status */
 77 extern void prepare_to_copy(struct task_struct *tsk);
 78 
 79 /* Create a new kernel thread. */
 80 extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
 81 
 82 /* Lazy FPU handling on uni-processor */
 83 extern struct task_struct *last_task_used_math;
 84 extern struct task_struct *last_task_used_altivec;
 85 extern struct task_struct *last_task_used_vsx;
 86 extern struct task_struct *last_task_used_spe;
 87 
 88 #ifdef CONFIG_PPC32
 89 
 90 #if CONFIG_TASK_SIZE > CONFIG_KERNEL_START
 91 #error User TASK_SIZE overlaps with KERNEL_START address
 92 #endif
 93 #define TASK_SIZE       (CONFIG_TASK_SIZE)
 94 
 95 /* This decides where the kernel will search for a free chunk of vm
 96  * space during mmap's.
 97  */
 98 #define TASK_UNMAPPED_BASE      (TASK_SIZE / 8 * 3)
 99 #endif
100 
101 #ifdef CONFIG_PPC64
102 /* 64-bit user address space is 44-bits (16TB user VM) */
103 #define TASK_SIZE_USER64 (0x0000100000000000UL)
104 
105 /* 
106  * 32-bit user address space is 4GB - 1 page 
107  * (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT
108  */
109 #define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE))
110 
111 #define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
112                 TASK_SIZE_USER32 : TASK_SIZE_USER64)
113 #define TASK_SIZE         TASK_SIZE_OF(current)
114 
115 /* This decides where the kernel will search for a free chunk of vm
116  * space during mmap's.
117  */
118 #define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4))
119 #define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(TASK_SIZE_USER64 / 4))
120 
121 #define TASK_UNMAPPED_BASE ((test_thread_flag(TIF_32BIT)) ? \
122                 TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 )
123 #endif
124 
125 #ifdef __KERNEL__
126 #ifdef __powerpc64__
127 
128 #define STACK_TOP_USER64 TASK_SIZE_USER64
129 #define STACK_TOP_USER32 TASK_SIZE_USER32
130 
131 #define STACK_TOP (test_thread_flag(TIF_32BIT) ? \
132                    STACK_TOP_USER32 : STACK_TOP_USER64)
133 
134 #define STACK_TOP_MAX STACK_TOP_USER64
135 
136 #else /* __powerpc64__ */
137 
138 #define STACK_TOP TASK_SIZE
139 #define STACK_TOP_MAX   STACK_TOP
140 
141 #endif /* __powerpc64__ */
142 #endif /* __KERNEL__ */
143 
144 typedef struct {
145         unsigned long seg;
146 } mm_segment_t;
147 
148 #define TS_FPROFFSET 0
149 #define TS_VSRLOWOFFSET 1
150 #define TS_FPR(i) fpr[i][TS_FPROFFSET]
151 
152 struct thread_struct {
153         unsigned long   ksp;            /* Kernel stack pointer */
154         unsigned long   ksp_limit;      /* if ksp <= ksp_limit stack overflow */
155 
156 #ifdef CONFIG_PPC64
157         unsigned long   ksp_vsid;
158 #endif
159         struct pt_regs  *regs;          /* Pointer to saved register state */
160         mm_segment_t    fs;             /* for get_fs() validation */
161 #ifdef CONFIG_PPC32
162         void            *pgdir;         /* root of page-table tree */
163 #endif
164 #if defined(CONFIG_4xx) || defined (CONFIG_BOOKE)
165         unsigned long   dbcr0;          /* debug control register values */
166         unsigned long   dbcr1;
167 #endif
168         /* FP and VSX 0-31 register set */
169         double          fpr[32][TS_FPRWIDTH];
170         struct {
171 
172                 unsigned int pad;
173                 unsigned int val;       /* Floating point status */
174         } fpscr;
175         int             fpexc_mode;     /* floating-point exception mode */
176         unsigned int    align_ctl;      /* alignment handling control */
177 #ifdef CONFIG_PPC64
178         unsigned long   start_tb;       /* Start purr when proc switched in */
179         unsigned long   accum_tb;       /* Total accumilated purr for process */
180 #endif
181         unsigned long   dabr;           /* Data address breakpoint register */
182 #ifdef CONFIG_ALTIVEC
183         /* Complete AltiVec register set */
184         vector128       vr[32] __attribute__((aligned(16)));
185         /* AltiVec status */
186         vector128       vscr __attribute__((aligned(16)));
187         unsigned long   vrsave;
188         int             used_vr;        /* set if process has used altivec */
189 #endif /* CONFIG_ALTIVEC */
190 #ifdef CONFIG_VSX
191         /* VSR status */
192         int             used_vsr;       /* set if process has used altivec */
193 #endif /* CONFIG_VSX */
194 #ifdef CONFIG_SPE
195         unsigned long   evr[32];        /* upper 32-bits of SPE regs */
196         u64             acc;            /* Accumulator */
197         unsigned long   spefscr;        /* SPE & eFP status */
198         int             used_spe;       /* set if process has used spe */
199 #endif /* CONFIG_SPE */
200 };
201 
202 #define ARCH_MIN_TASKALIGN 16
203 
204 #define INIT_SP         (sizeof(init_stack) + (unsigned long) &init_stack)
205 #define INIT_SP_LIMIT \
206         (_ALIGN_UP(sizeof(init_thread_info), 16) + (unsigned long) &init_stack)
207 
208 #ifdef CONFIG_SPE
209 #define SPEFSCR_INIT .spefscr = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE,
210 #else
211 #define SPEFSCR_INIT
212 #endif
213 
214 #ifdef CONFIG_PPC32
215 #define INIT_THREAD { \
216         .ksp = INIT_SP, \
217         .ksp_limit = INIT_SP_LIMIT, \
218         .fs = KERNEL_DS, \
219         .pgdir = swapper_pg_dir, \
220         .fpexc_mode = MSR_FE0 | MSR_FE1, \
221         SPEFSCR_INIT \
222 }
223 #else
224 #define INIT_THREAD  { \
225         .ksp = INIT_SP, \
226         .ksp_limit = INIT_SP_LIMIT, \
227         .regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \
228         .fs = KERNEL_DS, \
229         .fpr = {{0}}, \
230         .fpscr = { .val = 0, }, \
231         .fpexc_mode = 0, \
232 }
233 #endif
234 
235 /*
236  * Return saved PC of a blocked thread. For now, this is the "user" PC
237  */
238 #define thread_saved_pc(tsk)    \
239         ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
240 
241 #define task_pt_regs(tsk)       ((struct pt_regs *)(tsk)->thread.regs)
242 
243 unsigned long get_wchan(struct task_struct *p);
244 
245 #define KSTK_EIP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
246 #define KSTK_ESP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
247 
248 /* Get/set floating-point exception mode */
249 #define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
250 #define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
251 
252 extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
253 extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
254 
255 #define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr))
256 #define SET_ENDIAN(tsk, val) set_endian((tsk), (val))
257 
258 extern int get_endian(struct task_struct *tsk, unsigned long adr);
259 extern int set_endian(struct task_struct *tsk, unsigned int val);
260 
261 #define GET_UNALIGN_CTL(tsk, adr)       get_unalign_ctl((tsk), (adr))
262 #define SET_UNALIGN_CTL(tsk, val)       set_unalign_ctl((tsk), (val))
263 
264 extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
265 extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
266 
267 static inline unsigned int __unpack_fe01(unsigned long msr_bits)
268 {
269         return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
270 }
271 
272 static inline unsigned long __pack_fe01(unsigned int fpmode)
273 {
274         return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
275 }
276 
277 #ifdef CONFIG_PPC64
278 #define cpu_relax()     do { HMT_low(); HMT_medium(); barrier(); } while (0)
279 #else
280 #define cpu_relax()     barrier()
281 #endif
282 
283 /* Check that a certain kernel stack pointer is valid in task_struct p */
284 int validate_sp(unsigned long sp, struct task_struct *p,
285                        unsigned long nbytes);
286 
287 /*
288  * Prefetch macros.
289  */
290 #define ARCH_HAS_PREFETCH
291 #define ARCH_HAS_PREFETCHW
292 #define ARCH_HAS_SPINLOCK_PREFETCH
293 
294 static inline void prefetch(const void *x)
295 {
296         if (unlikely(!x))
297                 return;
298 
299         __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
300 }
301 
302 static inline void prefetchw(const void *x)
303 {
304         if (unlikely(!x))
305                 return;
306 
307         __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
308 }
309 
310 #define spin_lock_prefetch(x)   prefetchw(x)
311 
312 #ifdef CONFIG_PPC64
313 #define HAVE_ARCH_PICK_MMAP_LAYOUT
314 #endif
315 
316 #ifdef CONFIG_PPC64
317 static inline unsigned long get_clean_sp(struct pt_regs *regs, int is_32)
318 {
319         unsigned long sp;
320 
321         if (is_32)
322                 sp = regs->gpr[1] & 0x0ffffffffUL;
323         else
324                 sp = regs->gpr[1];
325 
326         return sp;
327 }
328 #else
329 static inline unsigned long get_clean_sp(struct pt_regs *regs, int is_32)
330 {
331         return regs->gpr[1];
332 }
333 #endif
334 
335 #endif /* __KERNEL__ */
336 #endif /* __ASSEMBLY__ */
337 #endif /* _ASM_POWERPC_PROCESSOR_H */
338 

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